/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.pinot.core.segment.processing.filter;

import org.apache.pinot.segment.local.function.FunctionEvaluator;
import org.apache.pinot.segment.local.function.FunctionEvaluatorFactory;
import org.apache.pinot.spi.data.readers.GenericRow;


/**
 * RecordFilter which evaluates the filter function to decide whether record should be skipped or not.
 * The filter function is expected to evaluate to true, if the record should be filtered
 */
public class FunctionEvaluatorRecordFilter implements RecordFilter {

  private final FunctionEvaluator _filterFunctionEvaluator;

  public FunctionEvaluatorRecordFilter(String filterFunction) {
    _filterFunctionEvaluator = FunctionEvaluatorFactory.getExpressionEvaluator(filterFunction);
  }

  @Override
  public boolean filter(GenericRow row) {
    if (_filterFunctionEvaluator != null) {
      Object filter = _filterFunctionEvaluator.evaluate(row);
      return Boolean.TRUE.equals(filter);
    }
    return false;
  }
}
